<SEC-DOCUMENT>0000947484-21-000140.txt : 20211029
<SEC-HEADER>0000947484-21-000140.hdr.sgml : 20211029
<ACCEPTANCE-DATETIME>20211029152056
ACCESSION NUMBER:		0000947484-21-000140
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20211029
DATE AS OF CHANGE:		20211029

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CALAMOS STRATEGIC TOTAL RETURN FUND
		CENTRAL INDEX KEY:			0001275214
		IRS NUMBER:				043785941
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-84333
		FILM NUMBER:		211362844

	BUSINESS ADDRESS:	
		STREET 1:		2020 CALAMOS COURT
		STREET 2:		C/O CALAMOS ADVISORS LLC
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60653
		BUSINESS PHONE:		6302451046

	MAIL ADDRESS:	
		STREET 1:		2020 CALAMOS COURT
		STREET 2:		C/O CALAMOS ADVISORS LLC
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60653

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ARCH CAPITAL GROUP LTD.
		CENTRAL INDEX KEY:			0000947484
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		IRS NUMBER:				980374481
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		WATERLOO HOUSE, GROUND FLOOR
		STREET 2:		100 PITTS BAY ROAD
		CITY:			PEMBROKE
		STATE:			D0
		ZIP:			HM 08
		BUSINESS PHONE:		441-278-9250

	MAIL ADDRESS:	
		STREET 1:		WATERLOO HOUSE, GROUND FLOOR
		STREET 2:		100 PITTS BAY ROAD
		CITY:			PEMBROKE
		STATE:			D0
		ZIP:			HM 08

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ARCH CAPITAL GROUP LTD
		DATE OF NAME CHANGE:	20000508

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RISK CAPITAL HOLDINGS INC
		DATE OF NAME CHANGE:	19950816

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RISK CAPITAL RE INC
		DATE OF NAME CHANGE:	19950703
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>a13g.htm
<DESCRIPTION>SC 13G
<TEXT>
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<title>Document</title></head><body><div id="i6eef22ed417942919428839a8356000d_1"></div><div style="min-height:45pt;width:100%"><div><font><br></font></div></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">UNITED STATES</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">SECURITIES AND EXCHANGE COMMISSION</font></div><div style="margin-bottom:10pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Washington, D.C. 20549</font></div><div style="margin-bottom:10pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">SCHEDULE 13G</font></div><div style="margin-bottom:10pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Under the Securities Exchange Act of 1934</font></div><div style="margin-bottom:10pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(Amendment No. _)*</font></div><div style="margin-bottom:5pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">CALAMOS STRATEGIC TOTAL RETURN FUND</font></div><div style="margin-bottom:6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:98.900%"></td><td style="width:0.1%"></td></tr><tr style="height:5pt"><td colspan="3" style="border-bottom:2pt solid #000000;padding:0 1pt"></td></tr></table></div><div><font><br></font></div><div style="margin-bottom:24pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(Name of Issuer)</font></div><div style="margin-bottom:5pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">Series D Mandatory Redeemable Preferred Shares</font></div><div style="margin-bottom:6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:98.900%"></td><td style="width:0.1%"></td></tr><tr style="height:5pt"><td colspan="3" style="border-bottom:2pt solid #000000;padding:0 1pt"></td></tr></table></div><div><font><br></font></div><div style="margin-bottom:24pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(Title of Class of Securities)</font></div><div style="margin-bottom:5pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">128125*52</font></div><div style="margin-bottom:6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:98.900%"></td><td style="width:0.1%"></td></tr><tr style="height:5pt"><td colspan="3" style="border-bottom:2pt solid #000000;padding:0 1pt"></td></tr></table></div><div><font><br></font></div><div><font><br></font></div><div style="margin-bottom:24pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(CUSIP Number)</font></div><div style="margin-bottom:5pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">August 31, 2021</font></div><div style="margin-bottom:6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:98.900%"></td><td style="width:0.1%"></td></tr><tr style="height:5pt"><td colspan="3" style="border-bottom:2pt solid #000000;padding:0 1pt"></td></tr></table></div><div><font><br></font></div><div style="margin-bottom:24pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(Date of Event which Requires Filing of this Statement)</font></div><div style="margin-bottom:12pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Check the appropriate box to designate the rule pursuant <br>to which this Schedule is filed&#58;</font></div><div style="margin-bottom:6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:22.953%"><tr><td style="width:1.0%"></td><td style="width:14.823%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:82.977%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#9746;</font></td><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Rule 13d-1(b)</font></td></tr><tr><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#9744;</font></td><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Rule 13d-1(c)</font></td></tr><tr><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#9744;</font></td><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Rule 13d-1(d)</font></td></tr></table></div><div style="margin-bottom:2pt;margin-top:2pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">&#160;&#160;&#160;&#160;</font><font style="font-family:'Wingdings',sans-serif;font-size:10pt;font-weight:400;line-height:139%"></font></div><div style="margin-bottom:12pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">*The remainder of this cover page shall be filled out for a reporting person&#8217;s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">The information required in the remainder of this cover page shall not be deemed to be &#8220;filed&#8221; for the purpose of Section 18 of the Securities Exchange Act of 1934 (&#8220;Act&#8221;) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).</font></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:45pt;width:100%"><div><font><br></font></div></div><div style="margin-bottom:5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">CUSIP No. 128125*52</font></div><div style="margin-bottom:6pt;padding-left:4.5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:9.433%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:6.692%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:73.358%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:2.507%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:2.510%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">1.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Names of Reporting Persons.</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-bottom:12pt;margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">I.R.S. Identification Nos. of above persons (entities only).</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:115%">&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Arch Capital Group Ltd.</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">2.</font></td><td colspan="6" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Check the Appropriate Box if a Member of a Group </font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(See Instructions)   </font></div><div><font><br></font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(a)</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#9744;</font></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="border-bottom:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(b)</font></td><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#9744;</font></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">3.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">SEC Use Only</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">4.</font></td><td colspan="6" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Citizenship or Place of Organization</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Bermuda</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">5.</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Sole Voting Power</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">280,000 (see Item 4)</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:2.65pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Number of </font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Shares </font></div><div style="margin-bottom:1.5pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Beneficially </font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">6.</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Shared Voting Power</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">0</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:2.65pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Owned by Each  </font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Reporting </font></div><div style="margin-bottom:1.5pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Person With&#58;</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">7.</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Sole Dispositive Power</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">280,000 (see Item 4)</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">8.</font></td><td colspan="3" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Shared Dispositive Power</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">0</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">9.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-bottom:12pt;margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Aggregate Amount Beneficially Owned by Each Reporting Person</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">280,000</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">10.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Check box if the Aggregate Amount in Row (9) Excludes  </font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Certain Shares (See Instructions)   </font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:top"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#9746;</font></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">11.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Percent of Class Represented by Amount in Row (9)</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">11.29%</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">12.</font></td><td colspan="6" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Type of Reporting Person (See Instructions)</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">CO</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr></table></div><div style="padding-left:36pt;text-indent:-36pt"><font><br></font></div><div style="text-align:center"><font><br></font></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:45pt;width:100%"><div><font><br></font></div></div><div style="margin-bottom:5pt;padding-left:36pt;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">CUSIP No. 128125*52</font></div><div style="margin-bottom:6pt;padding-left:4.5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:9.418%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:8.554%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:70.657%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:2.934%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:2.937%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">1.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Names of Reporting Persons.</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">I.R.S. Identification Nos. of above persons (entities only).</font></div><div><font><br></font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Arch Reinsurance Ltd.</font></div><div style="margin-bottom:1.5pt"><font><br></font></div><div style="margin-bottom:1.5pt"><font><br></font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">2.</font></td><td colspan="6" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Check the Appropriate Box if a Member of a Group  </font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(See Instructions)</font></div><div><font><br></font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(a)</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#9744;</font></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="border-bottom:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(b)</font></td><td colspan="3" style="padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#9744;</font></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">3.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">SEC Use Only</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">4.</font></td><td colspan="6" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Citizenship or Place of Organization</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Bermuda</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">5.</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Sole Voting Power</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">280,000 (see Item 4)</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:2.65pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Number of </font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Shares </font></div><div style="margin-bottom:1.5pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Beneficially </font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">6.</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Shared Voting Power</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">0</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:2.65pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Owned by Each  </font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Reporting </font></div><div style="margin-bottom:1.5pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Person With&#58;</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">7.</font></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Sole Dispositive Power</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">280,000 (see Item 4)</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">8.</font></td><td colspan="3" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Shared Dispositive Power</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">0</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">9.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-bottom:12pt;margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Aggregate Amount Beneficially Owned by Each Reporting Person</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">280,000</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">10.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Check box if the Aggregate Amount in Row (9) Excludes  </font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Certain Shares (See Instructions)   </font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt 2px 1.02pt;text-align:left;vertical-align:top"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#9746;</font></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">11.</font></td><td colspan="6" style="border-bottom:1pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Percent of Class Represented by Amount in Row (9)</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">11.29%</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">12.</font></td><td colspan="6" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:top"><div style="margin-top:1.65pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Type of Reporting Person (See Instructions)</font></div><div style="margin-bottom:1.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">CO</font></div></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr></table></div><div style="text-align:center"><font><br></font></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:45pt;width:100%"><div><font><br></font></div></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 1(a).&#160;&#160;&#160;&#160;Name of Issuer&#58;</font></div><div style="padding-left:36pt;text-indent:-36pt"><font><br></font></div><div style="margin-bottom:24pt;padding-left:36pt;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Calamos Strategic Total Return Fund (the &#8220;Issuer&#8221;)</font></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 1(b).&#160;&#160;&#160;&#160;Address of Issuer&#8217;s Principal Executive Offices&#58;</font></div><div style="padding-left:36pt;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">2020 Calamos Court, Naperville, Illinois 60653</font></div><div style="padding-left:36pt;text-indent:36pt"><font><br></font></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 2(a).&#160;&#160;&#160;&#160;Name of Person Filing&#58;</font></div><div style="margin-bottom:12pt;padding-left:72pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">This statement is filed jointly by each of the following persons pursuant to Rule 13d-1(k) promulgated by the Securities and Exchange Commission (the &#8220;SEC&#8221;) under Section 13 of the Act&#58; </font></div><div style="margin-bottom:12pt;padding-left:72pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(i) Arch Capital Group Ltd.&#59; and <br>(ii) Arch Reinsurance Ltd. (collectively the &#8220;Reporting Persons&#8221;)</font></div><div style="margin-bottom:24pt;padding-left:72pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">The reported securities are owned directly by Arch Reinsurance Ltd., a wholly owned subsidiary of Arch Capital Group Ltd.  See Exhibit A hereto.</font></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 2(b).&#160;&#160;&#160;&#160;Address of Principal Business Office&#58;</font></div><div style="margin-bottom:12pt;padding-left:72pt;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">&#160;&#160;&#160;&#160;The Address of the Principal Business Office of each Reporting Person is&#58;</font></div><div style="padding-left:72pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">100 Pitts Bay Road </font></div><div style="padding-left:72pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Waterloo House, Ground Floor <br>Pembroke Bermuda HM 08</font></div><div style="padding-left:72pt"><font><br></font></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 2(c).&#160;&#160;&#160;&#160;Citizenship&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">&#160;&#160;&#160;&#160;          </font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(i) Arch Capital Group Ltd. &#8212; Bermuda <br>&#160;&#160;&#160;&#160;          (ii) Arch Reinsurance Ltd. &#8212; Bermuda <br>&#160;&#160;&#160;&#160;</font></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 2(d).&#160;&#160;&#160;&#160;Title of Class of Securities&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Series D Mandatory Redeemable Preferred Shares</font></div><div style="padding-left:36pt;text-indent:36pt"><font><br></font></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 2(e).&#160;&#160;&#160;&#160;CUSIP Number&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">See cover page.</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Item 3.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Whether the Person Filing is a&#58;</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(a)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91; &#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o).</font></div><div><font><br></font></div><div><font><br></font></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:45pt;width:100%"><div><font><br></font></div></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(b)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91; &#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(c)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91;X&#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Insurance Company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c).</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(d)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91; &#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Investment Company registered under Section 8 of the Investment Company Act of</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">1940 (15 U.S.C. 80a-8).</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(e)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91; &#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">An investment adviser in accordance with Rule 240.13d-1(b)(1)(ii)(E)&#59;</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(f)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91; &#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">An employee benefit plan or endowment fund in accordance with Rule 240.13d-1(b)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(1)(ii)(F)&#59;</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(g)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91; &#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">A parent holding company or control person in accordance with Rule 240.13d-1(b)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(1)(ii)(G)&#59;</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(h)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91; &#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">A savings association as defined in Section 3(b) of the Federal Deposit</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Insurance Act (12 U.S.C. 1813)&#59;</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(i)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91; &#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">A church plan that is excluded from the definition of an investment company</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3)&#59;</font></div><div><font><br></font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">(j)</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">&#91; &#93;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Group, in accordance with Rule 240.13d-1(b)(1)(ii)(J).</font></div><div style="margin-bottom:12pt;padding-left:54pt;text-indent:-54pt"><font><br></font></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:45pt;width:100%"><div><font><br></font></div></div><div style="margin-bottom:12pt;padding-left:54pt;text-indent:-54pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 4.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Ownership&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt;padding-right:4.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%"> (a)&#160;&#160;&#160;&#160;Amount beneficially owned by each Reporting Person&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt;padding-right:4.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">&#160;&#160;&#160;&#160;(i) Arch Capital Group Ltd.&#160;&#160;&#160;&#160;    280,000* <br>&#160;&#160;&#160;&#160;(ii) Arch Reinsurance Ltd.&#160;&#160;&#160;&#160; 280,000* </font></div><div style="padding-left:72pt;padding-right:4.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">*As of the date hereof, the amount beneficially owned by each Reporting Person includes 280,000 Series D Mandatory Redeemable Preferred Shares directly owned by Arch Reinsurance Ltd.</font></div><div style="padding-left:72pt;padding-right:4.5pt"><font><br></font></div><div style="margin-bottom:12pt;padding-left:36pt;padding-right:4.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(b)&#160;&#160;&#160;&#160;Percent of class&#58; <br> <br>&#160;&#160;&#160;&#160;(i) Arch Capital Group Ltd.&#160;&#160;&#160;&#160;  11.29%**<br>&#160;&#160;&#160;&#160;(ii) Arch Reinsurance Ltd.&#160;&#160;&#160;&#160;11.29%**</font></div><div style="margin-bottom:12pt;padding-left:78.75pt;padding-right:4.5pt;text-indent:-4.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">**This percentage is calculated based on 2,480,000 Series D Mandatory Redeemable Preferred Shares issued and outstanding as of August 31, 2021.</font></div><div style="padding-left:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(c)&#160;&#160;&#160;&#160;</font></div><div style="padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Arch Capital Group Ltd.</font></div><div style="padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Number of shares as to which such person has&#58;</font></div><div style="padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font><br></font></div><div style="margin-bottom:2pt;padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(i)&#160;&#160;&#160;&#160;sole power to vote or to direct  <br>the vote&#58;&#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">280,000</font></div><div style="margin-bottom:2pt;padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(ii)&#160;&#160;&#160;&#160;shared power to vote or to direct  <br>the vote&#58;&#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">0</font></div><div style="margin-bottom:2pt;padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(iii)&#160;&#160;&#160;&#160;sole power to dispose or to direct  <br>the disposition of&#58;&#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">280,000</font></div><div style="margin-bottom:2pt;padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(iv)&#160;&#160;&#160;&#160;shared power to dispose or to direct  <br>the disposition of&#58;  &#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">0</font></div><div style="padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font><br></font></div><div style="padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Arch Reinsurance Ltd.</font></div><div style="padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Number of shares as to which such person has&#58;</font></div><div style="margin-bottom:2pt;padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(i)&#160;&#160;&#160;&#160;sole power to vote or to direct  <br>the vote&#58;&#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">280,000</font></div><div style="margin-bottom:2pt;padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(ii)&#160;&#160;&#160;&#160;shared power to vote or to direct  <br>the vote&#58;&#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">0</font></div><div style="margin-bottom:2pt;padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(iii)&#160;&#160;&#160;&#160;sole power to dispose or to direct  <br>the disposition of&#58;&#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">280,000</font></div><div style="margin-bottom:2pt;padding-left:114.75pt;padding-right:72pt;text-indent:-40.5pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">(iv)&#160;&#160;&#160;&#160;shared power to dispose or to direct  <br>the disposition of&#58;  &#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">0</font></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:45pt;width:100%"><div><font><br></font></div></div><div style="margin-bottom:12pt;padding-left:54pt;text-indent:-54pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 5.&#160;&#160;&#160;&#160;Ownership of Five Percent or Less of a Class&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Not Applicable</font></div><div style="margin-bottom:12pt;padding-left:54pt;text-indent:-54pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 6.&#160;&#160;&#160;&#160;Ownership of More than Five Percent on Behalf of Another Person&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Not Applicable</font></div><div style="margin-bottom:12pt;padding-left:54pt;text-indent:-54pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 7.&#160;&#160;&#160;&#160;Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Not Applicable</font></div><div style="margin-bottom:12pt;padding-left:54pt;text-indent:-54pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 8.&#160;&#160;&#160;&#160;Identification and Classification of Members of the Group&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Not Applicable </font></div><div style="margin-bottom:12pt;padding-left:54pt;text-indent:-54pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 9.&#160;&#160;&#160;&#160;Notice of Dissolution of Group&#58;</font></div><div style="margin-bottom:12pt;padding-left:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Not Applicable</font></div><div style="margin-bottom:12pt;padding-left:54pt;text-indent:-54pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Item 10.&#160;&#160;&#160;&#160;Certifications&#58;</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:115%">&#160;&#160;&#160;&#160;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">By signing below, I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.</font></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:45pt;width:100%"><div><font><br></font></div></div><div style="margin-bottom:24pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">SIGNATURES</font></div><div style="margin-bottom:24pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Dated&#58;  October 29, 2021</font></div><div style="padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">ARCH CAPITAL GROUP LTD.</font></div><div style="padding-left:180pt"><font><br></font></div><div style="padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">By&#58;  </font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%;text-decoration:underline">&#47;s&#47; Francois Morin</font></div><div style="margin-bottom:24pt;padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Name&#58;  Francois Morin<br>Title&#58; Executive Vice President, Chief Financial Officer and Treasurer</font></div><div style="padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">ARCH REINSURANCE LTD.</font></div><div style="padding-left:180pt"><font><br></font></div><div style="padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">By&#58;  </font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%;text-decoration:underline">&#47;s&#47; Jerome Halgan&#160;&#160;&#160;&#160;</font></div><div style="margin-bottom:24pt;padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Name&#58;  Jerome Halgan <br>Title&#58;  Chief Executive Officer</font></div><div style="height:45pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><div id="i6eef22ed417942919428839a8356000d_4"></div><hr style="page-break-after:always"><div style="min-height:119.25pt;width:100%"><div><font><br></font></div></div><div style="margin-bottom:24pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">EXHIBIT A</font></div><div style="margin-bottom:24pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:139%">Joint Filing Agreement</font></div><div style="margin-bottom:24pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Series D Mandatory Redeemable Preferred Shares of Calamos Strategic Total Return Fund, a Delaware company, and further agree that this Joint Filing Agreement be included as an exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this Agreement as of the date noted below.</font></div><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Dated&#58;  October 29, 2021</font></div><div style="padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">ARCH CAPITAL GROUP LTD.</font></div><div style="padding-left:180pt"><font><br></font></div><div style="padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">By&#58;  </font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%;text-decoration:underline">&#47;s&#47; Francois Morin</font></div><div style="margin-bottom:24pt;padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Name&#58;  Francois Morin<br>Title&#58; Executive Vice President, Chief Financial Officer and Treasurer</font></div><div style="padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">ARCH REINSURANCE LTD.</font></div><div style="padding-left:180pt"><font><br></font></div><div style="padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">By&#58;  </font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%;text-decoration:underline">&#47;s&#47; Jerome Halgan&#160;&#160;&#160;&#160;</font></div><div style="margin-bottom:24pt;padding-left:180pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:139%">Name&#58;  Jerome Halgan <br>Title&#58;  Chief Executive Officer</font></div><div><font><br></font></div><div style="height:83.25pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div></body></html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
